- Need to rethink support/structure. Maybe attach to the inside of an enclosure. The extended 'floating rod' should let you mount two of the rails against a flat backing surface for stability, or augment with additional crossed extrusions. The third rail would be flat against the opposite wall, or free standing.

I don't know about the statement that LISA is bad at scaling. Well, I don't know if it is any worse. I think uncle_bob is doing a lot of good due diligence and trying to make sure that he is going to get a solid build.

Scaling in general is an x^3 function because we are dealing in 3 dimensions after all. As a general rule, to go from a 150x150x150 machine to a 300x300x300 you will need to spend 8 times the money. Maybe not that extreme but somewhere between x^2 and x^3.

I am not opposed to other kind of rails but it adds to the vitamin count if you want the shoulder to rotate the way LISA needs it to.

I priced out a 2X LISA the other day and I was under $1000. I am pretty sure I can get a 3X under $2000.

Additionally, I think uncle_bob wants to do more than just print so that adds a big layer of costs.